Describes features and benefits of the person-centered approach to studying personality, identifies unanswered questions, and suggests research directions. Benefits noted include focus on intraindividual structure, descriptive efficiency, use of types as moderator variables, predictive validity, and conceptual clarity and intuitive appeal. Unanswered questions point to research needs in refining the taxonomy of personality types, identifying developmental origins and sequelae, and working toward deeper theoretical understanding of the types. (Author/KB)